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WO2016201680A1 - Unité de buse d'assemblage combustible - Google Patents

Unité de buse d'assemblage combustible Download PDF

Info

Publication number
WO2016201680A1
WO2016201680A1 PCT/CN2015/081826 CN2015081826W WO2016201680A1 WO 2016201680 A1 WO2016201680 A1 WO 2016201680A1 CN 2015081826 W CN2015081826 W CN 2015081826W WO 2016201680 A1 WO2016201680 A1 WO 2016201680A1
Authority
WO
WIPO (PCT)
Prior art keywords
rib
hole
fuel assembly
flow
flow hole
Prior art date
Application number
PCT/CN2015/081826
Other languages
English (en)
Chinese (zh)
Inventor
禹文池
周跃民
陈建新
张国梁
李伟才
陈晓明
刘雨利
Original Assignee
中科华核电技术研究院有限公司
中国广核集团有限公司
中国广核电力股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中科华核电技术研究院有限公司, 中国广核集团有限公司, 中国广核电力股份有限公司 filed Critical 中科华核电技术研究院有限公司
Priority to PCT/CN2015/081826 priority Critical patent/WO2016201680A1/fr
Publication of WO2016201680A1 publication Critical patent/WO2016201680A1/fr

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/322—Means to influence the coolant flow through or around the bundles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to the technical field of nuclear reactors, and in particular to a fuel assembly header unit of a nuclear reactor.
  • the fuel assembly of the nuclear reactor generally comprises a lower header, an upper header, a grid, a fuel rod, a guiding tube and an instrument tube, and the fuel rod, the guiding tube and the instrument tube are supported in parallel between the upper tube and the lower tube, all
  • the grid is fixed on the guide tube and the instrument tube at a certain distance along the axial direction of the fuel assembly, all grids have the same arrangement and number of cells, and the fuel rod, the guide tube and the instrument tube pass through each of the fuel assembly axially one by one. The cells in the same position of the grid.
  • the lower header 10 of the fuel assembly is mostly composed of a coupling plate 11 connected to four legs.
  • the coupling plate 11 is formed by a plurality of lower ribs 12.
  • the compartments 13 through which the fluid passes are separated, and the lower header 10 also covers the thin plate 14 (anti-foreign board) for chip protection.
  • the current lower header has the following problems: the flow field is uneven; the pressure drop is high.
  • the anti-foreign board 14 itself has a self-resistance coefficient, which has a natural balance effect on the uniform fluid, but the effect is blocked by the ribs 12 between the cavities and is not fully utilized.
  • the boundary between the rib 12 and the cell 15 on the gusset 11 is solid, and the lateral space of the foreign matter prevention panel is not fully utilized.
  • the technical problem to be solved by the present invention is to provide a fuel assembly header unit with a low pressure drop and a balanced flow field.
  • the technical solution adopted by the present invention to solve the technical problem is to provide a fuel assembly base unit, comprising a frame that is vertically permeable, a plurality of first ribs arranged in parallel in the frame, and a plurality of parallel a second rib arranged at intervals; the first rib and the second rib are arranged in a staggered manner, and a flow hole for longitudinally passing the fluid is separated in the frame;
  • the first ribs and/or the second ribs are provided with transverse flow holes for lateral passage of the fluid, the transverse flow holes communicating with the two flow holes on both sides thereof.
  • the cross flow holes are located at an upper end and/or a lower end of the first rib and/or the second rib.
  • the cross flow hole extends from an upper end surface of the first rib and/or the second rib to a lower end direction, and/or from the first rib and/or the second rib The lower end end extends in the upward direction;
  • the open end of the lateral flow hole extends transversely through the lateral dimension of the flow hole; the size of the transverse flow hole gradually decreases from the open end to the bottom thereof.
  • the header unit further includes a tube mounting portion disposed in the frame, the tube mounting portion being located at an intersection of the first rib and the second rib.
  • the plurality of tube mounting portions include an instrument tube mounting hole located in a middle portion of the frame body and a guide tube mounting hole located around the instrument tube mounting hole.
  • the header unit is a lower header, which further includes a leg connected below the corner of the frame.
  • the leg is further provided with a through hole extending longitudinally to the frame.
  • the header unit is an upper header or grid.
  • the stem unit further includes an anti-fouling plate covering the frame body, and a part of the fluid longitudinally passing through the water-flow hole is laterally flowed through the cross-flow hole under the blockage of the anti-foreign material plate;
  • the anti-foreign board includes a substrate and a filter hole group and a mounting hole group distributed on the substrate, and the mounting hole group is disposed corresponding to the tube mounting portion.
  • the filter hole diameter in the filter hole group is smaller than the flow hole diameter.
  • a cross flow hole is provided between the water holes in the frame body, which solves the shortcoming of sudden increase or sudden decrease of the flow blocking area in the prior art, and allows the fluid to be laterally before entering the foreign body prevention plate.
  • the flow and equilibrium flow field solves the strong lateral flow caused by the uneven flow field in the prior art.
  • FIG. 1 is a schematic cross-sectional structural view of a lower header in the prior art
  • Figure 2a is a schematic illustration of the flow direction of a fluid in a prior art fuel assembly
  • Figure 2b is a diagram showing the change of the flow blocking area in the lower header in the prior art
  • FIG. 3 is a schematic structural view of a fuel assembly header unit in a fuel assembly according to an embodiment of the present invention
  • Figure 4 is a schematic cross-sectional view of the frame body of the stem unit shown in Figure 3;
  • FIG. 5 is a schematic structural view of a fuel assembly header unit in a fuel assembly according to another embodiment of the present invention.
  • Figure 6 is a graph showing changes in the flow restriction area in the stem unit shown in Figure 5.
  • a fuel assembly base unit includes a frame 20 that is vertically permeable, a plurality of first ribs 21, and a plurality of second ribs 22, and a plurality of first ribs.
  • the plate 21 and the plurality of second ribs 22 are respectively arranged in parallel in the frame body 20.
  • the first rib 21 and the second rib 22 are staggered, and a water hole 23 through which the fluid passes longitudinally is partitioned in the frame 20, and the water hole 23 is also vertically permeable.
  • the first rib 21 and/or the second rib 22 are provided with a transverse flow hole 24 through which the fluid passes, the transverse flow hole 24 communicating with the two flow holes 23 on both sides thereof; when the fluid longitudinally passes through the flow hole 23, part of the fluid It is also possible to flow laterally between the flow holes 23 through the cross flow holes 24, so that the entire flow field is equalized, and the pressure drop is also effectively reduced.
  • the frame 20 may have a shape such as a square, a rectangle, a regular pentagon or a regular hexagon.
  • the first rib 21 and the second rib 22 are integrally formed with the frame 20 in the casing 20, and the overall structural strength is high.
  • the first rib 21 and the second rib 22 may be parallel to the diagonal of the frame 20 or parallel to the side plates of the frame 20, respectively.
  • the longitudinal areas of the first rib 21 and the second rib 22 constitute the side walls of the flow holes 23, and the lateral flow holes 24 are located on the side walls between the adjacent two flow holes 23.
  • the lateral flow hole 24 may be located on one side wall or a plurality of side walls thereof.
  • the side wall of the water injection hole 23 located at the outer periphery (near the frame body 20) is composed of the first rib 21, the second rib 22, and the side plates of the frame 20, and the side plates are not provided with lateral flow holes.
  • the lateral flow holes 24 are located at the upper ends of the first ribs 21 and/or the second ribs 22, and extend from the upper end faces of the first ribs 21 and/or the second ribs 22 to the lower end direction.
  • the lateral flow holes 24 may also be located at the lower ends of the first ribs 21 and/or the second ribs 22, extending from the lower end faces of the first ribs 21 and/or the second ribs 22 in the upward end direction.
  • the open end of the lateral flow hole 24 extends transversely across the lateral dimension of the flow hole 23 such that the open end dimension of the lateral flow hole 24 is substantially the same as the lateral dimension of the flow hole 23.
  • the size of the cross flow hole 24 is gradually reduced from the open end to the bottom thereof, so that the flow blocking area in the stem unit gradually decreases or gradually increases, and the pressure decreases, instead of suddenly decreasing or suddenly increasing. And the pressure drop is high.
  • the size of the cross-flow hole is gradually reduced, so that the lateral flow hole 24 has a saddle shape, a U shape, or a V shape, a parabola shape or a semicircular shape.
  • the fluid flows laterally along the flow holes 23 while passing through the frame 20, and lateral flow is also achieved through the flow holes 23 to equalize the flow field.
  • the lateral flow between the fuel rods 3 is weak (as indicated by an arrow C in Fig. 3) due to the uniform flow field, and the flow-induced vibration of the fuel rod 3 is reduced or avoided.
  • the header unit further includes a tube mounting portion (not shown) provided in the housing 20, and the tube mounting portion is located at the intersection of the first rib 21 and the second rib 22.
  • the plurality of pipe fittings may include an instrument pipe mounting hole located in a middle portion of the frame body 20 and a guide pipe mounting hole located around the instrument pipe mounting hole; the instrument pipe mounting hole is inserted into the instrument pipe of the fuel assembly, and the guiding pipe mounting hole is provided for fuel The guide tube of the assembly is plugged.
  • the instrument tube mounting hole and the plurality of guide tube mounting holes are arranged in an equally spaced array on the first rib 21 and the second rib 22.
  • the header unit is a lower header, which further includes legs 25 connected below the corners of the frame 20 for supporting on the lower core plate 2.
  • the leg 25 can be integrally formed with the frame 20. Fluid such as cooling water flows upward from the lower core plate 2 to the lower header, passes through the flow hole 23, contacts the fuel rod 3 of the fuel assembly, and cools the fuel rod 3.
  • the leg 25 is further provided with a through hole 250 extending longitudinally to the frame 20.
  • the through hole 250 is also capable of passing a fluid such as cooling water to increase the flow area of the entire stem unit.
  • the size of the through hole 250 may be larger than the size of the flow hole 23. Since the through hole 250 is located at a corner of the frame 20, the flow rate of the fluid through the through hole 250 is relatively small, and the foreign matter therein is not easily covered on the frame 20. The foreign board prevents damage.
  • the header unit further includes an anti-fouling plate 26 covering the frame 20 for filtering foreign matter in the fluid; a part of the fluid passing through the flow hole 23 in the longitudinal direction is blocked by the anti-object plate 26 through the cross-flow hole 24.
  • the lateral flow reduces the flow blocking area of the foreign matter prevention plate 26 and increases the flow area.
  • the anti-foreign board 26 is firmly supported by the top of the side panel of the frame 20, the tops of the first ribs 21 and the second ribs 22, and has a shape matching with the shape of the frame 20 so as to be conformable to the frame 20 .
  • the lateral passage flows and can flow upward through the filter hole group on the foreign matter prevention plate 26 during the flow.
  • the thickness thereof may be increased on the original basis.
  • the foreign matter prevention plate 26 may include a substrate 261 and a filter hole group and a mounting hole group (not shown) distributed on the substrate 261, and the fluid flows through the filter hole group and flows upward to the fuel rod 3.
  • the filter well set includes a plurality of filter holes 262, and the filter holes 262 in the filter hole set have a smaller pore size than the flow holes 23 to filter foreign matter of a smaller size in the fluid.
  • the mounting hole group is set corresponding to the pipe fitting mounting portion.
  • the mounting hole group includes a first mounting hole that communicates with the instrument tube mounting hole, and a second mounting hole that communicates with the guide tube mounting hole.
  • a fuel assembly base unit is different from the embodiment shown in the above figure in that the cross flow hole 24 is located at the first rib 21 and/or the second rib 22. Upper and lower ends. The horizontal flow hole 24 on the upper end and the horizontal flow hole 24 on the lower end are isolated from each other and are not connected. By the superimposed arrangement of the cross-flow holes 24 on the upper and lower ends, the lateral flow of the fluid between the flow holes 23 is enhanced to further balance the flow field.
  • D1, D2, and D3 represent a frame area, an anti-foreign board area, and a guide tube area, respectively.
  • D1 the fluid flows through the lateral flow of the upper end and the lower end transverse flow hole 24.
  • the flow blocking area gradually increases, and when the fluid flows out of the flow hole 23, the flow blocking area gradually decreases. Small; after passing D2, it is stable at D3 and smaller than the change when passing through the frame 20, reducing the pressure drop.
  • header unit of the present invention is not limited to the lower header.
  • the header unit can be an upper header or grid of the fuel assembly.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Fuel Cell (AREA)

Abstract

L'invention concerne une unité de buse d'un assemblage combustible, qui comprend un corps de cadre perméable verticalement (20), et une pluralité de premières plaques nervurées (21) disposées en parallèle à des intervalles et une pluralité de secondes plaques nervurées (22) disposées en parallèle à des intervalles dans le corps de cadre (20), les premières plaques nervurées (21) et les secondes plaques nervurées (22) étant disposées de manière décalée, un trou d'écoulement (23) prévu pour une traversée longitudinale de fluide étant séparé dans le corps de cadre (20) ; et la première plaque nervurée (21) et/ou la seconde plaque nervurée (22) étant pourvue(s) d'un trou d'écoulement transversal (24) prévu pour une traversée transversale du fluide, et le trou d'écoulement transversal (24) étant en communication avec deux trous d'écoulement (23) situés sur deux de ses deux côtés. L'unité de buse de l'assemblage combustible permet au fluide de s'écouler transversalement avant d'entrer dans une plaque de prévention contre des matières étrangères, ce qui équilibre un champ d'écoulement et résout le problème d'un fort écoulement transversal provoqué par un champ d'écoulement non uniforme de l'état de la technique.
PCT/CN2015/081826 2015-06-18 2015-06-18 Unité de buse d'assemblage combustible WO2016201680A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/081826 WO2016201680A1 (fr) 2015-06-18 2015-06-18 Unité de buse d'assemblage combustible

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/081826 WO2016201680A1 (fr) 2015-06-18 2015-06-18 Unité de buse d'assemblage combustible

Publications (1)

Publication Number Publication Date
WO2016201680A1 true WO2016201680A1 (fr) 2016-12-22

Family

ID=57544790

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/081826 WO2016201680A1 (fr) 2015-06-18 2015-06-18 Unité de buse d'assemblage combustible

Country Status (1)

Country Link
WO (1) WO2016201680A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107610786A (zh) * 2017-09-29 2018-01-19 岭东核电有限公司 燃料组件及其下管座
CN112185601A (zh) * 2020-09-30 2021-01-05 中国核动力研究设计院 一种反应堆双板均流式流量分配装置及分流结构
US20220406476A1 (en) * 2019-10-04 2022-12-22 Framatome Nuclear fuel assembly bottom end part debris filter and method of manufacturing such a debris filter
CN115588518A (zh) * 2022-10-10 2023-01-10 中国核动力研究设计院 一种基于流线型过滤棒结构的核燃料组件下管座

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4832905A (en) * 1988-04-15 1989-05-23 Combustion Engineering, Inc. Lower end fitting debris collector
CN1071528A (zh) * 1991-10-04 1993-04-28 法玛通公司 水冷核反应堆燃料组件的底部管座
US5225152A (en) * 1990-11-20 1993-07-06 Framatome Filtering bottom nozzle for a fuel assembly of a lightwater-cooled reactor
JP2005172747A (ja) * 2003-12-15 2005-06-30 Global Nuclear Fuel-Japan Co Ltd 下部タイプレート
CN102099868A (zh) * 2008-06-11 2011-06-15 阿海珐核能公司 核燃料组装体的下部管座
CN102867547A (zh) * 2012-09-18 2013-01-09 中科华核电技术研究院有限公司 轻水反应堆核燃料组件的下管座及底部装置
CN204166905U (zh) * 2014-10-16 2015-02-18 中科华核电技术研究院有限公司 具有流线型低压降流道的定位格架及燃料组件

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4832905A (en) * 1988-04-15 1989-05-23 Combustion Engineering, Inc. Lower end fitting debris collector
US5225152A (en) * 1990-11-20 1993-07-06 Framatome Filtering bottom nozzle for a fuel assembly of a lightwater-cooled reactor
CN1071528A (zh) * 1991-10-04 1993-04-28 法玛通公司 水冷核反应堆燃料组件的底部管座
JP2005172747A (ja) * 2003-12-15 2005-06-30 Global Nuclear Fuel-Japan Co Ltd 下部タイプレート
CN102099868A (zh) * 2008-06-11 2011-06-15 阿海珐核能公司 核燃料组装体的下部管座
CN102867547A (zh) * 2012-09-18 2013-01-09 中科华核电技术研究院有限公司 轻水反应堆核燃料组件的下管座及底部装置
CN204166905U (zh) * 2014-10-16 2015-02-18 中科华核电技术研究院有限公司 具有流线型低压降流道的定位格架及燃料组件

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107610786A (zh) * 2017-09-29 2018-01-19 岭东核电有限公司 燃料组件及其下管座
US20220406476A1 (en) * 2019-10-04 2022-12-22 Framatome Nuclear fuel assembly bottom end part debris filter and method of manufacturing such a debris filter
CN112185601A (zh) * 2020-09-30 2021-01-05 中国核动力研究设计院 一种反应堆双板均流式流量分配装置及分流结构
CN112185601B (zh) * 2020-09-30 2022-02-01 中国核动力研究设计院 一种反应堆双板均流式流量分配装置及分流结构
CN115588518A (zh) * 2022-10-10 2023-01-10 中国核动力研究设计院 一种基于流线型过滤棒结构的核燃料组件下管座
CN115588518B (zh) * 2022-10-10 2024-03-19 中国核动力研究设计院 一种基于流线型过滤棒结构的核燃料组件下管座

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